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Census Bureau, US Department of Commerce - Tabulating Machine, 1917.
HRM22B29_135

Census Bureau, US Department of Commerce - Tabulat...

Prototype of a digital heart rhythm monitor developed by Dr. L. Julian Haywood, 1966-1969. Creator: Unknown.
HRM21A73_153

Prototype of a digital heart rhythm monitor develo...

Lady Clerks Tabulating the American Census Returns', 1901.
HRM19F10_185

Lady Clerks Tabulating the American Census Returns...